/* ==================== 关于我们页面专属样式 ==================== */
.page-about {
  --page-gap: 2.5rem;
  --page-section-gap: 4rem;
  --page-card-radius: 16px;
  --page-grid-line: rgba(230, 126, 34, 0.12);
  --page-grid-line-strong: rgba(230, 126, 34, 0.25);
  --page-card-bg: rgba(255, 255, 255, 0.04);
  --page-card-hover-bg: rgba(255, 255, 255, 0.08);
  --page-detail-bg: rgba(230, 126, 34, 0.1);
  --page-trust-bg: rgba(44, 62, 80, 0.5);
  --page-trust-border: rgba(230, 126, 34, 0.3);
  --page-badge-green: #27AE60;
  --page-badge-orange: #E67E22;
  --page-badge-blue: #3498DB;

  font-family: var(--font-body);
  color: var(--text-primary);
  background-color: var(--bg-dark);
  position: relative;
}

/* ----- 容器 ----- */
.page-about__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
  display: flex;
  flex-direction: column;
  gap: var(--page-section-gap);
  padding-top: 1.5rem;
  padding-bottom: 3rem;
  position: relative;
  z-index: 1;
}

/* ----- 面包屑 ----- */
.page-about__breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--page-grid-line);
  margin-bottom: 0.5rem;
}

.page-about__breadcrumb a {
  color: var(--color-orange);
  text-decoration: none;
  transition: color var(--transition);
}

.page-about__breadcrumb a:hover,
.page-about__breadcrumb a:focus-visible {
  color: var(--cta-highlight);
  outline: 2px solid var(--color-orange);
  outline-offset: 2px;
}

.page-about__breadcrumb-sep {
  color: var(--text-secondary);
  font-weight: 300;
}

/* ----- 品牌理念区域 ----- */
.page-about__brand {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  position: relative;
}

.page-about__brand-text {
  order: 2;
}

.page-about__brand .section-title[data-index="01"]::before {
  content: attr(data-index);
  font-family: var(--font-mono);
  color: var(--color-orange);
  font-size: 0.75rem;
  display: block;
  margin-bottom: 0.5rem;
  letter-spacing: 0.1em;
  opacity: 0.8;
}

.page-about__brand-desc {
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-top: 1rem;
  max-width: 720px;
}

/* 品牌网格 (3项) */
.page-about__brand-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-top: 2rem;
}

.page-about__brand-item {
  background: var(--page-card-bg);
  border: 1px solid var(--page-grid-line);
  border-radius: var(--page-card-radius);
  padding: 1.25rem 1.5rem;
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
  cursor: default;
  position: relative;
}

.page-about__brand-item:hover {
  background: var(--page-card-hover-bg);
  border-color: var(--page-grid-line-strong);
  transform: translateY(-2px);
}

.page-about__brand-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-orange);
  opacity: 0.6;
  display: block;
  margin-bottom: 0.4rem;
  letter-spacing: 0.05em;
}

.page-about__brand-item-title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
}

.page-about__brand-item p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin: 0;
}

.page-about__brand-cta {
  display: inline-block;
  margin-top: 1.75rem;
  align-self: flex-start;
}

/* 品牌视觉区 */
.page-about__brand-visual {
  order: 1;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-about__brand-img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  object-fit: cover;
  position: relative;
  z-index: 2;
  box-shadow: 0 8px 32px rgba(0,0,0,0.3);
}

.page-about__brand-grid-bg {
  position: absolute;
  inset: -1rem;
  background-image:
    linear-gradient(var(--page-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--page-grid-line) 1px, transparent 1px);
  background-size: 24px 24px;
  z-index: 1;
  border-radius: var(--radius);
  opacity: 0.6;
  pointer-events: none;
}

/* ----- 秋季更新亮点区域 ----- */
.page-about__updates {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.page-about__updates-header {
  text-align: left;
}

.page-about__updates .section-title[data-index="02"]::before {
  content: attr(data-index);
  font-family: var(--font-mono);
  color: var(--color-orange);
  font-size: 0.75rem;
  display: block;
  margin-bottom: 0.4rem;
  letter-spacing: 0.1em;
  opacity: 0.8;
}

.page-about__updates-subtitle {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-top: 0.5rem;
}

/* 更新卡片网格 */
.page-about__updates-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

/* 单张卡片 */
.page-about__update-card {
  background: var(--page-card-bg);
  border: 1px solid var(--page-grid-line);
  border-radius: var(--page-card-radius);
  padding: 1.5rem;
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
  cursor: default;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.page-about__update-card:hover {
  background: var(--page-card-hover-bg);
  border-color: var(--color-orange);
  box-shadow: 0 4px 20px rgba(230, 126, 34, 0.08);
}

.page-about__update-card:focus-within {
  outline: 2px solid var(--color-orange);
  outline-offset: 2px;
}

.page-about__update-card-icon {
  color: var(--color-orange);
  margin-bottom: 0.25rem;
  width: 36px;
  height: 36px;
}

.page-about__update-card-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.page-about__update-card p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin: 0;
}

/* 悬停时显示的细节区 */
.page-about__update-card-detail {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 0.5rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--page-grid-line);
  opacity: 0;
  max-height: 0;
  overflow: hidden;
  transition: opacity 0.35s ease, max-height 0.4s ease, padding 0.3s ease;
}

.page-about__update-card:hover .page-about__update-card-detail,
.page-about__update-card:focus-within .page-about__update-card-detail {
  opacity: 1;
  max-height: 80px;
  padding-top: 0.75rem;
}

.page-about__update-card-detail-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.page-about__update-card-detail-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.2em 0.6em;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: var(--page-detail-bg);
  color: var(--color-orange);
}

/* 各徽章颜色变体 (通过顺序选择器区分) */
.page-about__update-card:nth-child(1) .page-about__update-card-detail-badge {
  background: rgba(39, 174, 96, 0.15);
  color: var(--page-badge-green);
}

.page-about__update-card:nth-child(2) .page-about__update-card-detail-badge {
  background: rgba(52, 152, 219, 0.15);
  color: var(--page-badge-blue);
}

.page-about__update-card:nth-child(3) .page-about__update-card-detail-badge {
  background: rgba(230, 126, 34, 0.15);
  color: var(--page-badge-orange);
}

.page-about__update-card:nth-child(4) .page-about__update-card-detail-badge {
  background: rgba(39, 174, 96, 0.15);
  color: var(--page-badge-green);
}

/* 更新区图片 */
.page-about__updates-visual {
  display: flex;
  justify-content: center;
  margin-top: 0.5rem;
}

.page-about__updates-img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  object-fit: cover;
  box-shadow: 0 4px 24px rgba(0,0,0,0.25);
}

.page-about__updates-more {
  display: flex;
  justify-content: flex-start;
  margin-top: 0.5rem;
}

.page-about__updates-cta {
  display: inline-block;
}

/* ----- 信任声明 ----- */
.page-about__trust {
  position: relative;
}

.page-about__trust .section-title[data-index="03"]::before {
  content: attr(data-index);
  font-family: var(--font-mono);
  color: var(--color-orange);
  font-size: 0.75rem;
  display: block;
  margin-bottom: 0.4rem;
  letter-spacing: 0.1em;
  opacity: 0.8;
}

.page-about__trust-inner {
  background: var(--page-trust-bg);
  border: 1px solid var(--page-trust-border);
  border-radius: var(--page-card-radius);
  padding: 2rem 1.75rem;
  text-align: center;
}

.page-about__trust-statement {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 600;
  line-height: 1.6;
  color: var(--text-primary);
  margin: 1rem 0 0.75rem 0;
  padding: 0;
  border: none;
  font-style: normal;
  quotes: none;
}

.page-about__trust-statement::before,
.page-about__trust-statement::after {
  content: none;
}

.page-about__trust-note {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 640px;
  margin: 0 auto;
}

/* ----- 底部氛围视觉 ----- */
.page-about__bottom-visual {
  width: 100%;
  overflow: hidden;
  border-radius: var(--radius);
  margin-top: 0.5rem;
  opacity: 0.7;
}

.page-about__bottom-img {
  max-width: 100%;
  height: auto;
  object-fit: cover;
  display: block;
  border-radius: var(--radius);
}

/* ==================== 响应式 ==================== */
/* 窄屏 (默认移动端优先) 已在上方定义 */

/* 平板及以上：≥600px */
@media screen and (min-width: 600px) {
  .page-about__inner {
    padding-left: 2rem;
    padding-right: 2rem;
    padding-top: 2rem;
  }

  .page-about__brand-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about__brand-item:last-child {
    grid-column: 1 / -1;
  }

  .page-about__updates-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about__trust-inner {
    padding: 2.5rem 3rem;
  }

  .page-about__trust-statement {
    font-size: 1.35rem;
  }
}

/* 桌面：≥900px */
@media screen and (min-width: 900px) {
  .page-about__inner {
    padding-left: 2.5rem;
    padding-right: 2.5rem;
    gap: var(--page-section-gap);
  }

  .page-about__brand {
    flex-direction: row;
    align-items: center;
    gap: 3rem;
  }

  .page-about__brand-text {
    order: 1;
    flex: 1.1;
  }

  .page-about__brand-visual {
    order: 2;
    flex: 0.9;
    max-width: 500px;
  }

  .page-about__brand-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about__brand-item:last-child {
    grid-column: auto;
  }

  .page-about__brand-desc {
    font-size: 1.15rem;
  }

  .page-about__updates-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about__updates-header {
    text-align: center;
  }

  .page-about__updates-subtitle {
    text-align: center;
  }

  .page-about__updates-more {
    justify-content: center;
  }

  .page-about__trust-inner {
    padding: 3rem 4rem;
  }
}

/* 宽屏：≥1100px */
@media screen and (min-width: 1100px) {
  .page-about__updates-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about__brand {
    gap: 4rem;
  }

  .page-about__brand-visual {
    max-width: 560px;
  }
}

/* 防止图片溢出 */
img {
  max-width: 100%;
  height: auto;
}

/* 确保卡片与按钮可访问 */
.btn:focus-visible {
  outline: 2px solid var(--color-orange);
  outline-offset: 3px;
}

/* 无JS时细节内容默认显示（渐进增强） */
@media (prefers-reduced-motion: reduce) {
  .page-about__update-card-detail {
    opacity: 1;
    max-height: none;
    padding-top: 0.75rem;
    transition: none;
  }

  .page-about__brand-item,
  .page-about__update-card {
    transition: none;
  }
}